Wall crack
These walls are cracks are simple straight up and down crack. likely caused by shrinkage.
Floor opened
a piece of the floor around the crack is opened up using a hand held jack hammer.
3 part sealant
The first par is a bead of flexible sealant. Next a 4" open cell foam is used for drainage as an added precaution. Then another layer of sealant added.
Trowel over
The third layer is troweled over the open cell foam.
Final wall membrane
a wall membrane called cleanspace covers the entire area and is tucked under the floor Then the floor can be restored back to original height.